I think most assume its going to be limited because thats how GW seem to run there boxed games lately, they release them for varying lengths of time then they go away. So people are naturally assuming that BaC is also limited.

I think Tawa is a temporal entity that exists outside of the hobby/modeling timeline. Essentially, he's the Heresy Online equivalent of a Time Lord... which is kinda hilarious and frightening all at the same time.